<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>14-下拉选择框的属性</title>

    <style>
        #select_my{
            width: 100px;
            height: 50px;

        }


    </style>
</head>
<body>


<select multiple="multiple">
    <option>111</option>
    <option>2222</option>
    <option>3333</option>
</select>

<select multiple="multiple" id="select_my">

    <option>xxxxxxx</option>
    <option>yyyyyyyy</option>
    <option>33rrrrr33</option>

    <option>xxxxxxx</option>
    <option>yyyyyyyy</option>
    <option>33rrrrr33</option>

    <option>xxxxxxx</option>
    <option>yyyyyyyy</option>
    <option>33rrrrr33</option>
</select>


<script type="text/javascript">


</script>
</body>
</html>